I need help with a) and b)

The following data relate the sales figures of the bar in Mark Kaltenbach's small bed-and-breakfast inn in Portland, to the number of guests registered that week: Week Guests Bar Sales 16 $320 12 $275 18 $390 14 $300 a) The simple linear regression equation that relates bar sales to number of guests (not to time) is (round your responses to one decimal place): Bar Sales = x guests b) If the forecast is 24 guests next week, the bar sales are expected to be $ (round your response to one decimal place)